<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <title>Server-Sent Events. Room "{{.roomid}}"</title>
        <!-- jQuery -->
        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
        <script src="http://malsup.github.com/jquery.form.js"></script> 
        <!-- EPOCH -->
        <script src="http://d3js.org/d3.v3.min.js"></script>
        <script src="/static/epoch.min.js"></script>
        <link rel="stylesheet" href="/static/epoch.min.css">
        <script src="/static/realtime.js"></script>
        <!-- Latest compiled and minified CSS -->
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
        <!-- Optional theme -->
        <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css">
        <!-- Latest compiled and minified JavaScript -->
        <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
        <!-- Primjs -->
        <link href="/static/prismjs.min.css" rel="stylesheet" />

        <script type="text/javascript">
            $(document).ready(function() { 
              StartRealtime({{.roomid}}, {{.timestamp}});
            });
        </script>
        <style>
        body { padding-top: 50px; }
        </style>
    </head>
    <body>
    <nav class="navbar navbar-fixed-top navbar-inverse">
      <div class="container">
        <div class="navbar-header">
          <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
          </button>
          <a class="navbar-brand" href="#">Server-Sent Events</a>
        </div>
        <div id="navbar" class="collapse navbar-collapse">
          <ul class="nav navbar-nav">
            <li class="active"><a href="#">Demo</a></li>
            <li><a href="http://www.w3.org/TR/2009/WD-eventsource-20091029/">W3 Standard</a></li>
            <li><a href="http://caniuse.com/#feat=eventsource">Browser Support</a></li>
            <li><a href="http://gin-gonic.github.io/gin/">Gin Framework</a></li>
            <li><a href="https://github.com/gin-gonic/gin/tree/develop/examples/realtime-advanced">Github</a></li>
          </ul>
        </div><!-- /.nav-collapse -->
      </div><!-- /.container -->
    </nav><!-- /.navbar -->
        <!-- Main jumbotron for a primary marketing message or call to action -->
        <div class="jumbotron">
            <div class="container">
                <h1>Server-Sent Events in Go</h1>
                <p>Server-sent events (SSE) is a technology where a browser receives automatic updates from a server via HTTP connection. It is not websockets. <a href="http://www.html5rocks.com/en/tutorials/eventsource/basics/">Learn more.</a></p>
                <p>The chat and the charts data is provided in realtime using the SSE implemention of <a href="https://github.com/gin-gonic/gin/blob/15b0c49da556d58a3d934b86e3aa552ff224026d/examples/realtime-chat/main.go#L23-L32">Gin Framework</a>.</p>
                <div class="row">
                    <div class="col-md-8">
                        <div id="chat-scroll" style="overflow-y:scroll; overflow-x:scroll; height:290px">
                            <table id="table-style" class="table" data-show-header="false">
                                <thead>
                                    <tr>
                                        <th data-field="nick" class="col-md-2">Nick</th>
                                        <th data-field="message" class="col-md-8">Message</th>
                                    </tr>
                                </thead>
                                <tbody id="chat"></tbody>
                            </table>
                        </div>
                        {{if .nick}}
                        <form autocomplete="off" class="form-inline" id="chat-form" action="/room-post/{{.roomid}}?nick={{.nick}}" method="post">
                            <div class="form-group">
                                <label class="sr-only" for="chat-message">Message</label>
                                <div class="input-group">
                                    <div class="input-group-addon">{{.nick}}</div>
                                    <input type="text" name="message" id="chat-message" class="form-control" placeholder="a message" value="" />
                                </div>
                            </div>
                            <input type="submit" class="btn btn-primary" value="Send" />
                        </form>
                        {{else}}
                        <form action="" method="get" class="form-inline">
                            <legend>Join the SSE real-time chat</legend>
                            <div class="form-group">
                                <input value='' name="nick" id="nick" placeholder="Your Name" type="text" class="form-control" />
                            </div>
                            <div class="form-group text-center">
                                <input type="submit" class="btn btn-success btn-login-submit" value="Join" />
                            </div>
                        </form>
                        {{end}}
                    </div>
                    <div class="col-md-4">
                        <div id="messagesChart" class="epoch category10"></div>
                        <p>
                        <span style="font-size:20px; color:#1f77b4">◼︎</span> Users<br>
                        <span style="font-size:20px; color:#ff7f0e">◼︎</span> Inbound messages / sec<br>
                        <span style="font-size:20px; color:#2ca02c">◼︎</span> Outbound messages / sec<br>
                        </p>
                    </div>
                </div>
            </div>
        </div>
        <div class="container">
            <div class="row">
                <h2>Realtime server Go stats</h2>
                <div class="col-md-6">
                    <h3>Memory usage</h3>
                    <p>
                    <div id="heapChart" class="epoch category20c"></div>
                    </p>
                    <p>
                    <span style="font-size:20px; color:#1f77b4">◼︎</span> Heap bytes<br>
                    <span style="font-size:20px; color:#aec7e8">◼︎</span> Stack bytes<br>
                    </p>
                </div>
                <div class="col-md-6">
                    <h3>Allocations per second</h3>
                    <p>
                    <div id="mallocsChart" class="epoch category20b"></div>
                    </p>
                    <p>
                    <span style="font-size:20px; color:#393b79">◼︎</span> Mallocs / sec<br>
                    <span style="font-size:20px; color:#5254a3">◼︎</span> Frees / sec<br>
                    </p>
                </div>
            </div>
            <div class="row">
                <h2>MIT Open Sourced</h2>
                <ul>
                    <li><a href="https://github.com/gin-gonic/gin/tree/develop/examples/realtime-advanced">This demo website (JS and Go)</a></li>
                    <li><a href="https://github.com/manucorporat/sse">The SSE implementation in Go</a></li>
                    <li><a href="https://github.com/gin-gonic/gin">The Web Framework (Gin)</a></li>
                </ul>
                <div class="col-md-6">
                <script src="/static/prismjs.min.js"></script>
                    <h3>Server-side (Go)</h3>
                    <pre><code class="language-go">func streamRoom(c *gin.Context) {
    roomid := c.ParamValue(&quot;roomid&quot;)
    listener := openListener(roomid)
    statsTicker := time.NewTicker(1 * time.Second)
    defer closeListener(roomid, listener)
    defer statsTicker.Stop()

    c.Stream(func(w io.Writer) bool {
        select {
        case msg := &lt;-listener:
            c.SSEvent(&quot;message&quot;, msg)
        case &lt;-statsTicker.C:
            c.SSEvent(&quot;stats&quot;, Stats())
        }
        return true
    })
}</code></pre>
                </div>
                <div class="col-md-6">
                    <h3>Client-side (JS)</h3>
                    <pre><code class="language-javascript">function StartSSE(roomid) {
    var source = new EventSource('/stream/'+roomid);
    source.addEventListener('message', newChatMessage, false);
    source.addEventListener('stats', stats, false);
}</code></pre>
                </div>
            </div>
            <div class="row">
                <div class="col-md-12">
                    <h3>SSE package</h3>
                    <pre><code class="language-go">import &quot;github.com/manucorporat/sse&quot;

func httpHandler(w http.ResponseWriter, req *http.Request) {
    // data can be a primitive like a string, an integer or a float
    sse.Encode(w, sse.Event{
        Event: &quot;message&quot;,
        Data:  &quot;some data\nmore data&quot;,
    })

    // also a complex type, like a map, a struct or a slice
    sse.Encode(w, sse.Event{
        Id:    &quot;124&quot;,
        Event: &quot;message&quot;,
        Data: map[string]interface{}{
            &quot;user&quot;:    &quot;manu&quot;,
            &quot;date&quot;:    time.Now().Unix(),
            &quot;content&quot;: &quot;hi!&quot;,
        },
    })
}</code></pre>
<pre>event: message
data: some data\\nmore data

id: 124
event: message
data: {&quot;content&quot;:&quot;hi!&quot;,&quot;date&quot;:1431540810,&quot;user&quot;:&quot;manu&quot;}</pre>
                </div>
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            <footer>
                <p>Created with <span class="glyphicon glyphicon-heart"></span> by <a href="https://github.com/manucorporat">Manu Martinez-Almeida</a></p>
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